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81-004 Patio Door Roller, 1-1/2" Steel Ball Bearing

Think I have 81-004 but cannot decide how to remove the old one, if it is screwed in from the top (10/32) screw, is there an easy way to get the screw out? If my instincts are correct, the glass prevents access to that screw.

What is the distance to one end from the hole on the top of the 81-004 housing?

What is width of 81-004 roller? Are there any other similar assemblies with 3/8 to 7/16 wide X 11/2 dia roller?